How is the Earth threatened by human actions? What are the future consequences?
Human activities are having unintended, severe and complicated impacts upon many organisms and their habitats. Activities that affect the bio-diversity are: Over-harvesting, Habitat loss, Islandisation, Climate change and Alien species.
All living things need resources to survive, whether for food or to provide shelter. Humans are just extremely efficient at getting hold of them. One third of the world’s resources have been used up in the last 30 years. Native species haven’t evolved around us and don’t recognise us as predators. People in countries such as America, Japan, and in Europe can use up to 30 times the amount of resources as people from poor countries. At the moment, humans are overexploiting fish, trees and waste too much fresh water. As a consequence, if we carry on, the fish stocks will dramatically deplete and will risk extinction. This can also cause a cascade effect if we catch prey or predators. Trees give out oxygen and in developing countries almost three billion people rely on wood for heating and cooking. global warming will significantly increase also there will be devastating land slides and floods. West Africa, Madagascar, Southeast Asia and many other regions have experienced lower revenue because of overexploitation and the consequent declining timber harvests. A solution to this is sustainable natural resource use. If we take from the wild, we must do it in ways that allows natural populations to recover and last long into the future. Blue whales and other large marine creatures were brought back from the brink of extinction because we stopped harvesting them to excess. If you catch fish faster than they can reproduce and replace what is taken, there will be no fish for anybody to use in the future. The same goes for forests. Energy sources such as wind and solar power can last forever; they are also cleaner and healthier.
HRD develops the key competencies that enable individuals in organizations to perform current and future jobs through planned learning activities. .: MEANING It is the process of increasing the capabilities of HR through development. It is a process of adding values to individuals, teams, organization as human system. Definition According to American Society for Training and Development ( ASTD ), ...
Habitat loss is the greatest threat to the natural world. We are taking over habitat at an alarming rate to provide ourselves with homes and agriculture as well as resources from forests, and other natural areas. When a habitat is destroyed, the plants, animals, and other organisms that occupied the habitat have a reduced carrying capacity so that populations decline and extinction becomes more likely. Perhaps the greatest threat to organisms and biodiversity is the process of habitat loss. An endemic organism that obtains limited ranges are most affected by habitat destruction, mainly because these organisms are not found anywhere else within the world and, have less chance of recovering. Many endemic organisms have very specific requirements for their survival that can only be found within a certain ecosystem, resulting in their extinction. In South Africa, a place called the Fynbos had unique vegetation. However, 40% of it was destroyed.We can prevent the problem from becoming worse by being more sensitive to where we go about our business as well as how. Everyone needs space and that includes the other creatures of this planet. Restoring damaged habitats is also an important step. Allow forests to regrow, clean up rivers, lakes and seas, and help to protect what still remains.
Islandisation is when an undisturbed habitat is left in the middle of modified habitats cutting animals off from each other. Places like islands, nature reserves and grasslands suffer from this problem. Although half of the Earth’s original forests still remain, less than half of these are in large patches that can hold large numbers of species. Many of the smaller national parks of America have lost numbers of their larger mammal species. The larger animals are the ones that need larger areas of habitat. But since no species exists in isolation, if a species disappears then the other species that depend on it and interact with it are also affected. When Jaguars disappeared from the tiny island of Barro Colorado in Panama, the whole ecosystem changed. Even if small populations of plants and animals can hang on, their populations may be too small to survive for long. Another type of species that is suffering is the Sliver-spotted butterflies. They are isolated to an extent that a disease could eliminate them. Make natural habitats as big as possible, and join together the small ones with habitat corridors. This allows animals to move between isolated areas which keep their populations large and healthy. This appears to be benefiting local wildlife, and the local people who depend on it.
A. Who makes up most of the pollution B. Who and what is harmed by pollution Conclusion: We need to use renewable resources and finding uses for waste products instead of creating pollution by throwing them out. Our environment is a crucial part of our lives, and we must learn how to treat it correctly. Without it we would not be living. We need to become more aware of the circumstances that are ...
Pollution can be local or widespread. The biggest pollution problem is global warming. This happens when greenhouse gases, such as CO2 are released into the atmosphere, trapping heat and causing the planet to warm up. Since species are adapted to particular climates, when the Earth warms up they have to move to keep comfortable. This can be difficult if natural habitats are isolated by human settlements and agriculture. Species living in water are often most strongly affected because water spreads pollution easier than land, and because we often dump our pollution into water. No fish will be able to survive in pollution if it does carry on. Global warming will affect every species on Earth to some extent, and although some species will thrive in warmer climates, many will not. An example of this is the oak forests. When global warming increases, acorns in the south die and the forests move north affecting the species that live in the south. To solve this problem we have to produce as little pollution as possible. Many people are switching to ‘clean technology’. That means having the same benefits from our modern life-style without the pollution. Electric cars, environmentally sensitive washing powders and solar-powered energy are examples. Less pollution is not only good for wildlife and nature – human health benefits from less pollution as well. That means lower medical bills, and a better quality of life. Little things such as not leaving your TV on standby can also make a difference.
The environment affects human health in many ways in this short passage I will talk about air pollution and polluted waters. Air pollution is everywhere, and no we do not always see it but it is their harming everyone’s health. Why is air pollution bad for children’s health because it harms their lungs and increases the chances or childhood asthma. Air pollution is harmful to children’s lungs, but ...
When new species are introduced to places where they have never existed naturally, they can sometimes cause a real problem for native wildlife. Not only can they affect local species by competing with them for food and resources, or even eating the natives, but they can also be very damaging to crops, people’s homes and even cause diseases. Australia is famous for alien species. Rabbits were introduced and affected everything there. Another example is Scotland. 5 hedgehogs were introduced and turned into 10,000. The species that would lose out were the Dunlin (ground nesting birds).
Hedgehogs are ‘switching predators’ so would switch prey if the eggs ran out affecting everything in the food chain. There must be tight regulation on bringing plants and animals across international borders, airports and shipping ports. The public mustn’t bring exotic species back home with them without a licence.
Overall, humans are the most destructive species on the planet. We pollute the world heavily, over harvest nature and break up habitats. Human manipulation of the environment has had some kind of impact on Earth’s geography and every kind of organism. These impacts are sometimes so significant they have wiped out entire species.